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Accounts Receivable, net - Net Accounts Receivables (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Receivables And Related Allowances [Line Items]    
Trade receivables $ 80,329 $ 72,505
Insurance claims 12,064 10,059
Other 1,335 873
Accounts receivable, gross 93,728 83,437
Allowance for doubtful accounts (504) (636)
Accounts receivable, net $ 93,224 $ 82,801